问两道数学题～～请指教～

sytear

都是来自blackhorse  牛牛的math 大纲

1.Stations X and Y are connected by two separate, straight, parallel rail lines that are 250 miles long.  Train P and train Q simultaneously left Station X and Station Y, respectively, and each train traveled to the other’s point of departure.  The two trains passed each other after traveling for 2 hours.  When the two trains passed, which train was nearer to its destination?

(1)   At the time when the two trains passed, train P had averaged a speed of 70 miles per hour.

(2)   Train Q averaged a speed of 55 miles per hour for the entire trip.

标准答案是e 我选a～第一个条件不是已经说明p走了140miles么～

2.If x is the product of the positive integers from 1 to 8, inclusive, and if i, k, m, and p are positive integers such that x = 2ⁱ3^k5^m7^p, then i + k + m + p =

a 4

b 7

c 8

d 11

e 12

 标准答案是c 我怎么算都是d～～～

请指教！

[此贴子已经被作者于2008-8-31 15:17:10编辑过]

ada3063

第2题我做出来也是11

sytear

顶下 望各位牛牛解答～～～

sytear

顶下 望各位牛牛解答～～～

pumpkinll

第二题也算个11出来???